3. Run an analyze on this table and its index.
SQL> analyze table MGMT_METRICS_RAW validate structure cascade;

4. Shutdown and open the database.

But i have another problem when i do a select on some tables using index or when i try to rebuild some indexes. The error is:
ERROR at line 1:
ORA-00600: internal error code, arguments: [25027], [49], [12595041], [], [],
[], [], [], [], [], [], []